package com.dpj.aqs;

import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.locks.ReentrantReadWriteLock;

//读读 不互斥，读写互斥，写写互斥
@Slf4j(topic = "c.TestReadWriteLock")
public class TestReadWriteLock {
    public static void main(String[] args) {
        DataContainer dc=new DataContainer();
        new Thread(()-> {

            dc.read();
        },"t1").start();

        new Thread(()-> {
            dc.write();
        },"t1").start();
    }

}

@Slf4j(topic = "c.DataContainer")
class DataContainer{
    private Object data;
    private ReentrantReadWriteLock rw=new ReentrantReadWriteLock();
    private ReentrantReadWriteLock.ReadLock r= rw.readLock();
    private ReentrantReadWriteLock.WriteLock w=rw.writeLock();
    public Object read(){
        log.debug("获取读锁");
        r.lock();
        try {
            log.debug("读取");
            Thread.sleep(1000);
            return data;
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            log.debug("释放读锁");
            r.unlock();
        }
        return data;
    }
    public void write(){
        log.debug("获取写锁");
        w.lock();
        try {
            log.debug("写入");
        } finally {

            w.unlock();
            log.debug("释放写锁");
        }
    }

}
